Key statistics. Approximately 11% of vehicle breakdowns are caused by cooling system failures. (AAA, Therman Law Offices, 2017-2023). Electrical problems or a blown fuse account for approximately 70% of radiator fan failures. (AutoTech Blackhawk, 2025).

If your radiator fan isn't working and your car is overheating, especially in traffic, the immediate steps are to turn off your air conditioning, turn on your heater to full blast, and find a safe place to pull over and let the engine cool. Ignoring the issue can lead to serious engine damage, so prompt action is crucial for both your vehicle's health and your safety.

Statistic Source
Approximately 11% of vehicle breakdowns are caused by cooling system failures. AAA, Therman Law Offices (2017-202
Top Reasons for Roadside Breakdowns (resulting in a tow) Top Reasons for Roadside Breakdowns (resulting in a tow). Battery & Related Electrical Issues: 23, Engine Cooling System Failures: 11, Tire Damage: 10, Other Mechanical/Electrical Issues: 56. Source: AAA 2017 Top Reasons for Roadside Breakdowns (resulting in a tow) 100% Battery & Related Electrical Issues: 23% Engine Cooling System Failures: 11% Tire Damage: 10% Other Mechanical/Electrical Issues: 56% Source: AAA 2017

Frequently Asked Questions

Can I drive with a broken radiator fan?

It is generally not recommended to drive with a broken radiator fan, especially in slow-moving traffic or while idling. Without the fan, your engine can quickly overheat and suffer severe damage, leading to expensive repairs.

What are the signs of a faulty radiator fan motor?

Key signs include the radiator fan not spinning when the engine is hot or the air conditioning is on, unusual grinding or rattling noises coming from the fan area, and the engine temperature gauge rising when driving at low speeds or idling.

Why does my car overheat only in traffic?

Your car may overheat only in traffic because at low speeds or while idling, there is not enough natural airflow to cool the radiator. The radiator fan is designed to provide this essential airflow in such conditions, so if it's faulty, the engine will quickly overheat.

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Rachel Kwan Automotive Content Lead
Rachel Kwan researches and fact-checks every Carvy guide against official vehicle authority and manufacturer data before publication, so drivers get clear, accurate answers they can rely on.

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